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<tr class="t-nv-h1"><td colspan="5"> Associative</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="set.html" title="cpp/container/set"><span class="t-lines"><span>set</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="multiset.html" title="cpp/container/multiset"><span class="t-lines"><span>multiset</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="multimap.html" title="cpp/container/multimap"><span class="t-lines"><span>multimap</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Unordered associative</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unordered_set.html" title="cpp/container/unordered set"><span class="t-lines"><span>unordered_set</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"><tt>std::span</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="span/span.html" title="cpp/container/span/span"><span class="t-lines"><span>span::span</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Element access</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="span/operator_at.html" title="cpp/container/span/operator at"><span class="t-lines"><span>span::operator[]</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="span/data.html" title="cpp/container/span/data"><span class="t-lines"><span>span::data</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="span/as_bytes.html" title="cpp/container/span/as bytes"><span class="t-lines"><span>as_bytes</span><span>as_writable_bytes</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="span/dynamic_extent.html" title="cpp/container/span/dynamic extent"><span class="t-lines"><span>dynamic_extent</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="span/deduction_guides.html" title="cpp/container/span/deduction guides">Deduction guides</a></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><a href="../header/span.html" title="cpp/header/span">&lt;span&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <br>
<p>    <span class="kw1">class</span> T, <br>
    <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> Extent <span class="sy1">=</span> <a href="span/dynamic_extent.html"><span class="kw2633">std::<span class="me2">dynamic_extent</span></span></a><br>
</p>
<span class="sy1">&gt;</span> <span class="kw1">class</span> span<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx20">(since C++20)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>The class template <code>span</code> describes an object that can refer to a contiguous sequence of objects with the first element of the sequence at position zero. A <code>span</code> can either have a <i>static</i> extent, in which case the number of elements in the sequence is known at compile-time and encoded in the type, or a <i>dynamic</i> extent.
</p><p>If a <code>span</code> has <i>dynamic</i> extent a typical implementation holds two members: a pointer to <code>T</code> and a size.
A <code>span</code> with <i>static</i> extent may have only one member: a pointer to <code>T</code>.
</p>
 <table class="t-rev-begin">
<tr class="t-rev t-since-cxx23"><td>
<p>Every specialization of <code>std::span</code> is a <a href="../named_req/TriviallyCopyable.html" title="cpp/named req/TriviallyCopyable"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">TriviallyCopyable</span></a> type.
</p>
</td>
<td><span class="t-mark-rev t-since-cxx23">(since C++23)</span></td></tr>
</table>
<h3><span class="mw-headline" id="Template_parameters">Template parameters</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  T
</td>
<td> -
</td>
<td>  element type; must be a complete object type that is not an abstract class type
</td></tr>
<tr class="t-par">
<td>  Extent
</td>
<td> -
</td>
<td>  the number of elements in the sequence, or <code>std::dynamic_extent</code> if dynamic
</td></tr></table>
<h3><span class="mw-headline" id="Member_types">Member types</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-hitem">
<td>  Member type
</td>
<td>  Definition
</td></tr>


<tr class="t-dsc">
<td>  <code>element_type</code>
</td>
<td>  <code>T</code>
</td></tr>


<tr class="t-dsc">
<td>  <code>value_type</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../types/remove_cv.html"><span class="kw599">std::<span class="me2">remove_cv_t</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span></span></span>
</td></tr>


<tr class="t-dsc">
<td>  <code>size_type</code>
</td>
<td>  <span class="t-lc"><a href="../types/size_t.html" title="cpp/types/size t">std::size_t</a></span>
</td></tr>


<tr class="t-dsc">
<td>  <code>difference_type</code>
</td>
<td>  <span class="t-lc"><a href="../types/ptrdiff_t.html" title="cpp/types/ptrdiff t">std::ptrdiff_t</a></span>
</td></tr>


<tr class="t-dsc">
<td>  <code>pointer</code>
</td>
<td>  <code>T*</code>
</td></tr>


<tr class="t-dsc">
<td>  <code>const_pointer</code>
</td>
<td>  <code>const T*</code>
</td></tr>


<tr class="t-dsc">
<td>  <code>reference</code>
</td>
<td>  <code>T&amp;</code>
</td></tr>


<tr class="t-dsc">
<td>  <code>const_reference</code>
</td>
<td>  <code>const T&amp;</code>
</td></tr>


<tr class="t-dsc">
<td>  <code>iterator</code>
</td>
<td>  implementation-defined <a href="../named_req/RandomAccessIterator.html" title="cpp/named req/RandomAccessIterator"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">LegacyRandomAccessIterator</span></a>, <a href="../named_req/ConstexprIterator.html" title="cpp/named req/ConstexprIterator"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">ConstexprIterator</span></a>, and <a href="../iterator/contiguous_iterator.html" title="cpp/iterator/contiguous iterator"><code>contiguous_iterator</code></a> whose <code>value_type</code> is <code>value_type</code>
</td></tr>


<tr class="t-dsc">
<td>  <code>reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw660">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>iterator<span class="sy1">&gt;</span></span></span>
</td></tr>

</table>
<p>Note: <code>iterator</code> is a mutable iterator if <code>T</code> is not const-qualified.
</p><p>All requirements on the iterator types of a <a href="../named_req/Container.html" title="cpp/named req/Container"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">Container</span></a> apply to the <code>iterator</code> type of <code>span</code> as well.
</p>
<h3><span class="mw-headline" id="Member_constant">Member constant</span></h3>
<table class="t-dcl-begin"><tbody>

<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> extent <span class="sy1">=</span> Extent<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<h3><span class="mw-headline" id="Member_functions">Member functions</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="span/span.html" title="cpp/container/span/span"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td>  constructs a <code> span</code> <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/operator%3D.html" title="cpp/container/span/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td>   assigns a <code>span</code>  <br> <span class="t-mark">(public member function)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Iterators">  Iterators </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/begin.html" title="cpp/container/span/begin"> <span class="t-lines"><span>begin</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   returns an iterator to the beginning  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/end.html" title="cpp/container/span/end"> <span class="t-lines"><span>end</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   returns an iterator to the end  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/rbegin.html" title="cpp/container/span/rbegin"> <span class="t-lines"><span>rbegin</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   returns a reverse iterator to the beginning  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/rend.html" title="cpp/container/span/rend"> <span class="t-lines"><span>rend</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   returns a reverse iterator to the end  <br> <span class="t-mark">(public member function)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Element_access">  Element access </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/front.html" title="cpp/container/span/front"> <span class="t-lines"><span>front</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   access the first element  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/back.html" title="cpp/container/span/back"> <span class="t-lines"><span>back</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   access the last element  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/operator_at.html" title="cpp/container/span/operator at"> <span class="t-lines"><span>operator[]</span></span></a></div></div>
</td>
<td>   accesses an element of the sequence  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/data.html" title="cpp/container/span/data"> <span class="t-lines"><span>data</span></span></a></div></div>
</td>
<td>   returns a pointer to the beginning of the sequence of elements  <br> <span class="t-mark">(public member function)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Observers">  Observers </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/size.html" title="cpp/container/span/size"> <span class="t-lines"><span>size</span></span></a></div></div>
</td>
<td>   returns the number of elements in the sequence  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/size_bytes.html" title="cpp/container/span/size bytes"> <span class="t-lines"><span>size_bytes</span></span></a></div></div>
</td>
<td>   returns the size of the sequence in bytes  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/empty.html" title="cpp/container/span/empty"> <span class="t-lines"><span>empty</span></span></a></div></div>
</td>
<td>   checks if the sequence is empty  <br> <span class="t-mark">(public member function)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Subviews">  Subviews </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/first.html" title="cpp/container/span/first"> <span class="t-lines"><span>first</span></span></a></div></div>
</td>
<td>   obtains a subspan consisting of the first N elements of the sequence  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/last.html" title="cpp/container/span/last"> <span class="t-lines"><span>last</span></span></a></div></div>
</td>
<td>   obtains a subspan consisting of the last N elements of the sequence  <br> <span class="t-mark">(public member function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/subspan.html" title="cpp/container/span/subspan"> <span class="t-lines"><span>subspan</span></span></a></div></div>
</td>
<td>   obtains a subspan  <br> <span class="t-mark">(public member function)</span> </td></tr>
</table>
<h3><span class="mw-headline" id="Non-member_functions">Non-member functions</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/as_bytes.html" title="cpp/container/span/as bytes"> <span class="t-lines"><span>as_bytes</span><span>as_writable_bytes</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   converts a <code>span</code> into a view of its underlying bytes  <br> <span class="t-mark">(function template)</span> </td></tr>
</table>
<h3><span class="mw-headline" id="Non-member_constant">Non-member constant</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="span/dynamic_extent.html" title="cpp/container/span/dynamic extent"> <span class="t-lines"><span>dynamic_extent</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   a constant of type <code>size_t</code> signifying that the <code>span</code> has dynamic extent  <br> <span class="t-mark">(constant)</span> </td></tr>
</table>
<h3><span class="mw-headline" id="Helper_templates">Helper templates</span></h3>
<table class="t-dcl-begin"><tbody>

<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> Extent<span class="sy1">&gt;</span><br>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> <a href="../ranges/borrowed_range.html"><span class="kw3275">ranges::<span class="me2">enable_borrowed_range</span></span></a><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T, Extent<span class="sy1">&gt;&gt;</span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>This specialization of <span class="t-lc"><a href="../ranges/borrowed_range.html" title="cpp/ranges/borrowed range">ranges::enable_borrowed_range</a></span> makes <code>span</code> satisfy <a href="../ranges/borrowed_range.html" title="cpp/ranges/borrowed range"><code>borrowed_range</code></a>.
</p>
<table class="t-dcl-begin"><tbody>

<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> Extent<span class="sy1">&gt;</span><br>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> <a href="../ranges/view.html"><span class="kw3276">ranges::<span class="me2">enable_view</span></span></a><span class="sy1">&lt;</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T, Extent<span class="sy1">&gt;&gt;</span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>This specialization of <span class="t-lc"><a href="../ranges/view.html" title="cpp/ranges/view">ranges::enable_view</a></span> makes <code>span</code> satisfy <a href="../ranges/view.html" title="cpp/ranges/view"><code>view</code></a>.
</p>
<h3><span class="mw-headline" id="Deduction_guides"><a href="span/deduction_guides.html" title="cpp/container/span/deduction guides">Deduction guides</a></span></h3>
<h3><span class="mw-headline" id="Notes">Notes</span></h3>
<p>Specializations of <code>std::span</code> are already trivially copyable types in all existing implementations, even before the formal requirement introduced in C++23.
</p>
<table class="wikitable">
<tr>
<td> <a href="../feature_test.html#Library_features" title="cpp/feature test">Feature-test</a> macro:
</td>
<td> <a href="../utility/feature_test.html" title="cpp/utility/feature test"><tt>__cpp_lib_span</tt></a>
</td></tr></table>
<h3><span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><p>The example uses <code>std::span</code> to implement some algorithms on contiguous ranges.</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;cstddef&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;span&gt;</span>
 
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N<span class="sy1">&gt;</span> <span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> slide<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,N<span class="sy1">&gt;</span> s, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> offset, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> width<span class="br0">)</span> <span class="br0">{</span>
    <span class="kw1">return</span> s.<span class="me1">subspan</span><span class="br0">(</span>offset, offset <span class="sy2">+</span> width <span class="sy1">&lt;=</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy4">?</span> width <span class="sy4">:</span> 0U<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> M<span class="sy1">&gt;</span> <span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> starts_with<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,N<span class="sy1">&gt;</span> data, std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,M<span class="sy1">&gt;</span> prefix<span class="br0">)</span> <span class="br0">{</span>
    <span class="kw1">return</span> data.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&gt;=</span> prefix.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> 
        <span class="sy3">&amp;&amp;</span> <a href="../algorithm/equal.html"><span class="kw1577">std::<span class="me2">equal</span></span></a><span class="br0">(</span>prefix.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, prefix.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, data.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> M<span class="sy1">&gt;</span> <span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> ends_with<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,N<span class="sy1">&gt;</span> data, std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,M<span class="sy1">&gt;</span> suffix<span class="br0">)</span> <span class="br0">{</span>
    <span class="kw1">return</span> data.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&gt;=</span> suffix.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> 
        <span class="sy3">&amp;&amp;</span> <a href="../algorithm/equal.html"><span class="kw1577">std::<span class="me2">equal</span></span></a><span class="br0">(</span>data.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> suffix.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span>, data.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, 
                      suffix.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> suffix.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> N, <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> M<span class="sy1">&gt;</span> <span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span>
<span class="kw4">constexpr</span> <span class="kw4">bool</span> contains<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,N<span class="sy1">&gt;</span> span, std<span class="sy4">::</span><span class="me2">span</span><span class="sy1">&lt;</span>T,M<span class="sy1">&gt;</span> sub<span class="br0">)</span> <span class="br0">{</span>
    <span class="kw1">return</span> <a href="../algorithm/search.html"><span class="kw1584">std::<span class="me2">search</span></span></a><span class="br0">(</span>span.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, span.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, sub.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, sub.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> span.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">//  return std::ranges::search(span, sub).begin() != span.end();</span>
<span class="br0">}</span>
 
<span class="kw4">void</span> print<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> seq<span class="br0">)</span> <span class="br0">{</span>
    <span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span><span class="sy3">&amp;</span> elem <span class="sy4">:</span> seq<span class="br0">)</span> <a href="../io/cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> elem <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span><span class="sy4">;</span>
    <a href="../io/cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw4">constexpr</span> <span class="kw4">int</span> a<span class="br0">[</span><span class="br0">]</span> <span class="br0">{</span> <span class="nu0">0</span>, <span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">5</span>, <span class="nu0">6</span>, <span class="nu0">7</span>, <span class="nu0">8</span> <span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">constexpr</span> <span class="kw4">int</span> b<span class="br0">[</span><span class="br0">]</span> <span class="br0">{</span> <span class="nu0">8</span>, <span class="nu0">7</span>, <span class="nu0">6</span> <span class="br0">}</span><span class="sy4">;</span>
 
    <span class="kw1">for</span> <span class="br0">(</span><a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> offset<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span> <span class="sy4">;</span> <span class="sy2">++</span>offset<span class="br0">)</span> <span class="br0">{</span>
        <span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../types/size_t.html"><span class="kw106">std::<span class="me2">size_t</span></span></a> width<span class="br0">{</span><span class="nu0">6</span><span class="br0">}</span><span class="sy4">;</span>
        <span class="kw4">auto</span> s <span class="sy1">=</span> slide<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a<span class="br0">}</span>, offset, width<span class="br0">)</span><span class="sy4">;</span>
        <span class="kw1">if</span> <span class="br0">(</span>s.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>
            <span class="kw1">break</span><span class="sy4">;</span>
        print<span class="br0">(</span>s<span class="br0">)</span><span class="sy4">;</span>
    <span class="br0">}</span>
 
    static_assert<span class="br0">(</span>
        starts_with<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a<span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a, <span class="nu0">4</span><span class="br0">}</span> <span class="br0">)</span> and
        starts_with<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a <span class="sy2">+</span> <span class="nu0">1</span>, <span class="nu0">4</span><span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a <span class="sy2">+</span> <span class="nu0">1</span>, <span class="nu0">3</span><span class="br0">}</span> <span class="br0">)</span> and
      <span class="sy3">!</span> starts_with<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a<span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>b<span class="br0">}</span> <span class="br0">)</span> and
      <span class="sy3">!</span> starts_with<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a, <span class="nu0">8</span><span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a <span class="sy2">+</span> <span class="nu0">1</span>, <span class="nu0">3</span><span class="br0">}</span> <span class="br0">)</span> and
        ends_with<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a<span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a <span class="sy2">+</span> <span class="nu0">6</span>, <span class="nu0">3</span><span class="br0">}</span> <span class="br0">)</span> and
      <span class="sy3">!</span> ends_with<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a<span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a <span class="sy2">+</span> <span class="nu0">6</span>, <span class="nu0">2</span><span class="br0">}</span> <span class="br0">)</span> and
        contains<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a<span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a <span class="sy2">+</span> <span class="nu0">1</span>, <span class="nu0">4</span><span class="br0">}</span> <span class="br0">)</span> and
      <span class="sy3">!</span> contains<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a, <span class="nu0">8</span><span class="br0">}</span>, std<span class="sy4">::</span><span class="me2">span</span><span class="br0">{</span>a, <span class="nu0">9</span><span class="br0">}</span> <span class="br0">)</span>
    <span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">0 1 2 3 4 5 
1 2 3 4 5 6 
2 3 4 5 6 7 
3 4 5 6 7 8</pre></div></div> 
</div>
<h3><span class="mw-headline" id="Defect_reports">Defect reports</span></h3>
<p>The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th> DR
</th>
<th> Applied to
</th>
<th> Behavior as published
</th>
<th> Correct behavior
</th></tr>
<tr>
<td> <a rel="nofollow" class="external text" href="https://wg21.link/P2325R3">P2325R3</a>
</td>
<td> C++20
</td>
<td> <code>span</code> of non-zero static extents were not <code>view</code>
</td>
<td> they are as <a href="../concepts/default_initializable.html" title="cpp/concepts/default initializable"><code>default_initializable</code></a> is not required
</td></tr></table>
<h3><span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../utility/initializer_list.html" title="cpp/utility/initializer list"> <span class="t-lines"><span>initializer_list</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>   creates a temporary array in <a href="../language/list_initialization.html" title="cpp/language/list initialization">list-initialization</a> and then references it  <br> <span class="t-mark">(class template)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../string/basic_string_view.html" title="cpp/string/basic string view"> <span class="t-lines"><span>basic_string_view</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>   read-only string view  <br> <span class="t-mark">(class template)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../ranges/subrange.html" title="cpp/ranges/subrange"> <span class="t-lines"><span>ranges::subrange</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   combines an iterator-sentinel pair into a <a href="../ranges/view.html" title="cpp/ranges/view"><code>view</code></a>  <br> <span class="t-mark">(class template)</span> </td></tr>
</table>

<!-- 
NewPP limit report
Preprocessor visited node count: 8013/1000000
Preprocessor generated node count: 13996/1000000
Post‐expand include size: 193316/2097152 bytes
Template argument size: 43364/2097152 bytes
Highest expansion depth: 22/40
Expensive parser function count: 0/100
-->

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